Currently, the output of Special:EntityData/Q23.ttl claims that George Washington is a Wikibase Item <<entity:Q23 a wikibase:Item>>, which is clearly false. Our description of George Washington is a Wikidata Item <<data:Q23 a wikibase:Item>>.
We should also consider (optionally) omitting these is-a statements, since they are extremely redundant.
Side node: this issue is reflected by the RDFS spec at the lowest level, which claims that everything is an rdfs:Resource:
All things described by RDF are called resources, and are instances of the class rdfs:Resource.
This is the class of everything. All other classes are subclasses of this class. rdfs:Resource is an
instance of rdfs:Class.
There does not seem a distinction between the thing and the description of the thing built into the rdfs spec. Can we go back 15 years and fix this?...